My fermwrap kept shorting out and needed replaced. Not sure if you have seen this but it was new to me. I have used it for a couple beers now and works great. It is a heating pad but you do not attach it to the fermenter. It is like a space heater for a small space with no moving parts. The back side is a big sticker so it can be put on a wall inside your fermenting fridge or whatever you use. I just lay mine on the floor of the fridge so I can move it around of necessary. Works great! Smelled funny at first with a new plastic smell but that has already faded.

It's only 25 watts, so I imagine it's like a heating pad on low or medium.I've considered a reptile heater, but have not gotten there yet. I've found a 40w lamp puts off too much heat for my setup.This looks interesting.

I really like it because it is not too hot and very simple. You don't attach it directly to the fermenter. Just have it somewhere in your fermenting chamber. I added a bunch of random stuff to a Williams order because I wanted their nifty spigots for my Fermonsters.